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Current transformers (CTs) are important in power grids because they feed the protection relays with current signals. So the accuracy of their output signals should beensured in various conditions. Different factors affect the accuracy of the CT output current. Some of them such as thestray flux produced by the adjacent bus bars current and theeccentricity of the primary conductor with respect to the CT cause the magnetic field distribution of the current transformerto be asymmetric. So they can result in the current transformer local saturation in specific conditions which can lead to theundesirable operation of the protection relays. In this paper, the operation of a typical current transformer with protection coreis analyzed in the presence of these factors. The conditions considered in this paper include the operation under the adjacent bus bar overload and when there is an eccentricity in the primary conductor with respect to the CT core. These conditions are analyzed using 2D FEM.

An existing platform should undergo the assessment process if one or more of the following conditions exist: 1) Addition of personnel 2) Increased loading on Structure 3) Damage found during inspection and etc. A structure should be evaluated based on its current status, accounting for any damage, repair, or other factors affecting its...

Limits of deformation of sheet with a circular hole, under axial and biaxial tensile tests, have been extensively studied by engineers and researchers as a criterion of ductile formability. Therefore numerous numerical and experimental attempts and analyses have been reported. One of the most important challenges confronting the...

Previous experience earthquakes and experimental evidences have presented that structures display extra strength than which have been designed under lateral loads. This is due to the presence of the remarkable stored strength which is not considered in the design. This strength is called over–strength which is defined by over–strength...

Image segmentation is an important research area in computer vision and many image segmentation methods have been proposed, therefore it is necessary to be able to evaluate theperformance of image segmentation algorithms objectively. In this paper we present a new metric to evaluate the accuracy ofimage segmentation algorithms, based on...

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راهنمای دریافت مقاله‌ی «Finite Element Analysis of the Asymmetric Field Distribution Effect on the Operation of a Current Transformer» در حال تکمیل می‌باشد.